Expansible core adapter



ay 6, 1958 F.- J. KERBER 2,833,488

EXPANSIBLE CORE ADAPTER Filed May.24, 1956 PM Mr J. kERBE/P INVENTOR.

United States PatentC 2,833,488 EXPANSTBLE CORE ADAPTER Frank J. Kerber,Cedar Grove, N. J., assignor to John Dusenbery Company, Inc, Verona, N.J., n corporation of New Jersey Application May 24, 1956, Serial No.586,993 4 Claims. (Cl. 242-'--55.15)

This invention relates to. a core adapted for use in the windingmechanism of a slitting machine and more particularly to an expandingcore. adapter which holds a core upon which ribbons of material issuingfrom the slitting machine are wound. Expanding core adapters of the typecontemplated by this invention have particular application inthe windingmechanism of paper slitting machines wherein the ribbons of paper whichfeedfrom the slitting machine are wound upon rotatably driven cores. Thecores upon which the ribbons of material are wound are often made ofpaper and are constructed with a bore having tolerances of 2%.! orgreater. The expandingcore adapter of this invention is used to mountthe core on a, rotating shaft whereby the ribbons of material may bewound on the core. The core must fit snugly to the expanding coreadapter so as to rotate therewith and yet be free enough to enable oneto easily remove the core from the adapter by hand.

An object of this. invention is the provision of an arrangement for.securing a core to an expansible core adapter by which arrangementrelative rotary movement between the core and expansible core adapter isprevented and yet the core may be freely slid on to and off from theexpanding core adapter.

An objectof this invention is the provision of an expansible coreadapter for use in mounting a core upon a rotatable shaft, the saidexpansiblecore adapter comprising a cylindrical-shaped body having acircumferential annular groove therein, an annular resilient memberpositioned in the said groove, and a coil spring positioned in the saidgroove. over the said annular resilient member, the sides of the springcoils normally extending above the said groove whereby a'core may belongitudinally pressed over the said core adapter, the said core beingrestrained from relative rotary movement with the said core adapter byaction of the spring coils on the core.

These and other objects and advantages will become apparent from thefollowing description when taken with the accompanying. drawings. Itwill be understood the drawings are for purposes of illustration and arenot to be construed as defining the scope or limits of the invention,reference being had for the latter purpose to the appended claims.

In the drawings wherein like reference characters denote like parts inthe, severalviews:

Figure 1 is a fragmentary front elevation of the winding mechanism of apaper slitting machine wherein the expansible core adapter of myinvention is embodied,

Figure 2 is a central cross sectional view of my novel expansible coreadapter showing a core mounted thereon, and

Fig 3 isa side View of my expansible core adapter.

Reference is now made to Figure. 1 wherein there is shown a shaft ormandrel 1 which is rotatably supported on a pair of suitable bearings 2and caused to rotate by meansof a pulley3 attached to one end of themandrel and a belt 4 which engages the pulley and is driven by a sourceof power not shown in the drawing. Three novel Cir -' tolerances of %4"or greater.

expanding core adapters, designated generally by the reference numerals6, 7 and 8, are shown mounted spaced distances apart on the shaft, ormandrel, 1. While only three expansible core adapters are shown, it willbe understood that any number may be mounted on a shaft of suflicientlength. The bore in the expanding core adapters are large enough topermit rotation of the core adapters on the mandrel. Ribbons 9, 10 and11, which may be of paper, plastic, metal or any other suitable materialcapable of being slit and wound, areshown being wound on cores 13,14"and 15, which cores are mounted on the expansible' core adapters 6, 7and 8, respectively. The cores upon which the ribbons are wound areoften made of paper and are constructed with 'a bore having Theexpansible core adapter of my invention is utilized'to suitably mountsuch cores having diiferent diameter bores. The novel connection betweenthe respective core and expansible core adapter, which comprisesanimportant part of this invention, is shown in detail'in Figures 2 and3 of. the drawings and will be fully described later in thespecification. The ribbons 9, 10 and 11 come ofi a cutting machinemechanism (not shown in the drawings) at a spaced distance apart andtherefore the core and expanding core adapters are spaced on the mandrelso as'to be in lateral alignment with the oncoming ribbons. Lateralalignment of the expansible core adapters is accomplished by the use ofa first fixed collar 16 which is secured to the mandrel 1 as by a setscrew 17, or any other suitable. means, and spacers 18 and 19, which arepositioned between the expansible core adapters 6, 7 and 8. The spacers18 and 19 are secured to the mandrel 1 in such, a manner so as to rotatetherewith and yet, at the same time, are axially slidable thereon. Thisis accomplished by use of a key 20 which is mounted in a radial opening22 in theyspacer' as shown in the broken section of the drawingof thespacer 18. The key is provided with an elongated portion 21 whichextends internally of the" spacer into a keyway 23 which runs the entirelength of the mandreh By making the keyway 23 larger than the elongatedportion 21 of the key 20, the spacers will easilyslide axially on themandrel 1 and yet rotate therewith.

justed by changing the position at which the stop collar- 27 is fixed tothe mandrel. The method by which an axial force is exerted on tbestackedelements is not essential to this invention and forms no part thereof.Other metheds-such as adjustable fluid pressure means could be used inplace of-the spring 26 and associated parts. Also, it is obvious thatthe slidable collar 25 may be another spacer such as the spacer 18or.19.

The operation of the winding mechanism of the slitting machine in whichmy novel expansible core adapter'is embodied may now be understood. Themachine is set up for operation by axially adjusting. the fixed stopcollar 16, after first loosening the set screw 17, to a position wherethe core 13, which has been properly placed in position on theexpansible core adapter 6, is in alignment with the ribbon 9 which iscoming olf the slitting machine. The set screw 17 is then retightened. Aspacer 18 is next chosen of a proper width so as to place the core 14,which is on the expansible core adapter. 7, in alignment with the ribbon10.. The spacer 18 is keyed to the mandrel 1 as above described. In asimilar manner, the spacer 19 is selected and the expanding core adapter8, along with the core 15, are properly mounted on the mandrel. The

below. t

The ribbons 9,10 @111 come ofi the slitting machine at a relativelyconstant rate determined primarily by'the rate at which the material isfed to the slitting machine. are: mandrel 1 is rotated at a speed whichwouldwin-d the ribbons on the cores faster than the ribbons come offtheslitting machine. The' ribbons 9, and 11,0bviously, can not be woundup faster than they become. available andi'therefore, slipping occursbetween the spacers 181and 191 (which rotate with the, mandrel) and theexpansible core adapters 6, .7 and8. This arrangement of staclredspacers and expansible core adapters results in a clutch engagementsimilar to the action of a multiple disc clutch; Slipping, of course,increases as the roll of ribbon: builds up on the core during thewinding process. The winding tension is dependent upon the axial forcebetween the stacked spacers and expansible core adapters and maybeadjusted by adjusting the position of the. stop csnarzv on the mandrel1.

Wheri the, cores 13, 14 and 15 are wound full, they are removed from theexpansible coreadapters 6, 7 and 8,

respectively, and empty cores placed thereon. Heretofore, when only onecore adapter per core was used, it was .difiicult to obtain a snug fitbetween the core and core adapter so as to hold the two together withoutrelative rotary movementduring the winding process, and yet 'havea corewhich was easilyreniioved from the expansible core adapter byhand.Because the core bores have "atoleran'ce of $96 or greater, as mentionedearlier, the core adapter must be of the adjustable or expansible typeto accommodate the range of sizes of the core bores. Expansiblecoreadapters to date have been both expansive to construct and cumbersome touse thereby making the handling of the same a slow process.

Reference is now made to Figures 2 and 3 of the drawings' wherein thereis shownmy novel expansible .core

adapter whichlis both economical to manufacture-and simple to operate.The expansible core adapter comprises a cylindrical-shapedbody portionwhich is provided with an annular radial outwardly extending flange Thecore is slid to a position where the side of the core abuts the flange31. The flange 31 helps to square the core on the adapter where only asingle adapter per core is used. It may here be noted that where a widecore is being used, two adapters per core may be utilized; one adapterbeing pushed into each end of the core thereby providing the core with apair of stable bearing supports.

Through the compression of the spring and resilient O-ring, the springcoils exert a constant radial pressure on the core. The pressure whichis exerted, causes the spring coils to dig very slightly into the boreof the core and thereby prevent the core from rotating on the expansiblecore adapter. Even though the expanding action of the spring andresilient O-ring is relatively light, the

multiplicity of the spring coils afiords an effective reand it isintended thatsuch changes and modifications shall fall within thespiritand scope of the, invention as recited in the following claims.

I claim: l

1. A core adapter for mounting a core on a rotatable shaft, the saidcore adapter comprising a cylindricalshaped body having an annulargroove therein, an annular resilient member seated in the said annulargroove, a coil spring in the said annular groove over the resilientmember, the said coil spring having spring coils normally extendingradially above the circumferential edge of the groove whereby a core maybe axially pressed over the said cylindrical-shaped body and restrainedfrom rotary movement therewith by action of the spring coils on thecore, and means mounting the said core adapter on a rotatable shaft.

2. An expansible core adapter for, use in mounting a core on a rotatableshaft, the said expansible core adapter 7 comprising acylindrical-shaped body member having an friction coeflicient materialsuch as plastic or other suitable material. The bushing may be pressfitted in the bore of the expansible coreadapter and further held inplace by an inwardlyextending annular flange '37, which fits in a recessin the bushing 36, and by staking the body 30 of .theexpansible coreadapteriover the chamfered edge 38 ofthe bushing. The faces 39 and 40may be machined to present smooth "friction surfaces for coaction withthe spacers 18 and 19 described in connection with Figure 1 of thedrawings t As mentioned above, the cores which fit on the expansiblecore adapters have bores of difierent sizes due to manufacturingtolerancsfl The dimensions of the expansible core adapter are'suchj thatthe outer periphery ofthe encircling garter spring :34 is slightlylarger than the maximum boreofany core, while the diameter of thecylindrical portion of the body 30, over which the core fits, isslightlyless than the minimum bore of any core; aresult, when a core is pushedaxially onto an expansible core adapter and over the spring 34 the resilient O-ring 33 compresses, allowing the spring diameter to contractand permitting the core to pass over the spring.

annular groove. therein, an annular resilient member positioned in the.said annulargroove, a coil spring encircling the said cylindrical-shapedbody member and positioned in the saidv groove over the said annularresilient member whereby the sides of the spring coils normally extendradially beyond the edge of the said annular groove, the said springcoils being adapted to be pressed radially inwardly in the said grooveupon axially sliding a core onto the said cylindrical-shapedbody member,alnd means mounting the said core adapter on a rotatable s aft.

3. The invention ,as recited in claim 2, including an outwardlyextending'fiange onthe said cylindrical-shaped body member, which flangeis adapted to abut a side of the core when the core is in position onthe expansible core adapter.

4. The invention as recited in claim 3 wherein the means mounting thesaid core adapter on a rotatable shaft includes a bushing of lowcoefiicient material pressed in the said cylindrical-shaped body member.

References Cited in the file of this patent UNITED STATES PATENTS2,446,690 Carpenter n Aug. 10, 1948 2,704,681 Fischer 'Mar. 22, 19552,777,644 Nicholson Ian. 15, 1957 FOREIGN PATENTS 11,998 Great Britainor 1908

